Switch mechanism.



W. HERSKOVITZ.

SWITCH MBUHANISM.

APPLICATION FILED num, 191s.

Patented Mar. 3, 1914 UNITED STATES PATENT OFFICE.

WILLIAM HEBSKOVITZ, 0F CHICAGO, ILLINOIS.l

SWITCH MECHAN ISM.

Specification of Letters Patent.

Application filed January 9, 1913. Serial No.` 740,921.

To all whom it may concern Be it known that L WILLIAM HERsKovITz, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have inventeda new and useful Improvement in Switch Mechanism, of which the following is a specification.

My invention relates to switch mecha--v cal cross section, Fig. 3is a view looking at Fig. 2 from the left, the shell being` removed, Fig. 4 isa lan view. looking from plane L1 4; Fig. 2, Fig. 5 is a plan `view taken on plane 5 5, Fig. 2, Fig. 6 is a plan view taken ony plane 6 6,Fig. 2, Fig. 7 isa sectional viewtaken on plane 7 7, Fig: 1, the ratchet wheel being in section on plane 7 7, Fig. 5, Fig. 8 is a sectional view of the ratchet wheel taken on plane 8 8, Fig. 5, and Fig. 9 is a sectional view of the ratchet wheel taken o n plane 9 9,.Fig. 5.

The various operating switch parts are arranged in thespace between the upper and lower supporting -blcks 10 and 11 spaced and held apart by plates 12 and'13. The threaded shell 14 for receiving a lamp or socket extends'from the lower block 11 and is held thereto by4 screws 15 and 16 passing through the block and threading to plate 12 and nut 17 respectively, the plate being thecircuit terminal for the shell and carrying clamping screw 18. Thetip terminal 19of the socket is in 4the lform of a V shaped spring secured by one limb tothe base of block 11 by screw 20. The screw extends throughl and engages with its head against the bottom of a metallic-cylindric cup 21 sunk into block'll, this cup being connected' with switch spring 22 by a metal plate 23. As shown, this plate may be integral with the cup, and an intermediate section 23 thereoi` bent back a distance against, Y'

itself and theenddeflected upwardly and laterally to formY the spring terminal 22.

Agecrew 24: secures the outer end ofthe plate to blockll.' Directly above plate 23, the upper block 10 carries a circuit terminal 25 which has binding screw 26. From this terf minal ,25 the upperfswitch spring 27 extends and terminates vertically above the end of lower switch spring 22. The leads from a current supply circuit are connected tothe clrcuit terminals 12 and 25 by binding screws 18 and 26 respectively, terminal 12 connecting permanently with the sleeve 14 trical connection of the switch springs 22 and 27.

The electrical connectionof the switch springs is controlled by a disk .28 rotatable on the pivot pin 29.. The disk is of insulating material and extending therethrough at` diametrically opposite sides are metallic switch plates 30 and 31. `Whenever either plate comes between the switch springs, such Patented Maris, 1914. l

while the other terminal depends for its con'- -nection with. the tip. spring 19 on the elecsprings are electrically connected and the socket tip terminal 19 will .be connected with'the supply circuit.V At all other points thevinsulation body of the disk will be between the springs to electrically disconnect them. The lower end of pin 29 extends into cup 21 while at its upper end its head 32 extends into pocket 33 in the upper block 10. Seglnental plates 34 and 35 are pivoted at their apexes on the pin respectively above V and below the switch disk 28 and are spaced and held` apart at their outer edges by posts 36. Between the plates and the disk washers'37 and 38 are inserted on the pivot pin. The lo'wer plate 35 bears on a washer 39 encircling the projecting end of the cup 21 into which the pin extends. The plates connected by the posts form a ratchet pawl carrying structure, the pawl 4:0 being pivoted` "on the post 41 extending between the plates.l

This pawl cooperates with the ratchet teeth 28 on switch disk 28, there being four such l teeth equally spaced apart. The pawl may, as shown, be ofvsheet metal and provided with the pivot loop 40 at an intermediate pointto receive the pivot post-4:1. The tail 4:0 of the pawl is bifurcated to receivek and confine the end bead of the pull chain 42, this chain passing out through the ltiered guide thimble 13 v:forming part of thplate 13 as clearly shown.

pivot post and the pawl body and when the chain -is ypulled the pawl tail is swung out and the pawl point is forced against The chain passes in front ofthe pawl the. periphery of the switch disk to engage i with a ratchet tooth and to thus cause the disk to rotate with the pawl supporting structure. To restore the pawl supporting structure a spring 43 is provided and encircles the pin 29 between upper plate 34 and the head 32 of the (pin. The upper end. of vthe lspring is secure to the head by passing through a hole 32 therethrough, while the lower end abuts against post 44 on plate 34. The head 32 is polygonal as is likewise the pocket 33, and the spring by pressing against the head and pawl-supporting structure, tends to hold this structure seated against washer 39 and to-hold the head in the pocket to prevent turning of the in. Below pocket 33 is a pocket 45 which is larger than the head so that if the head is pushed down out of the polygonal pocket it may be turned to adjust the tenkvsion of the spring, andwhen the head again enters the polygonal pocket the adjustment will be maintained. The cup 21 is of suiiicient depth to allow the pin to be'pushed downto release its head. Thg head has preferably a slot 32" so that abs? rew driver may be used to efect adjustment. When the chain is released the pawl frame'is swung back, the terminal 25 forming an abutment therefor. During such restoring movement of the pawl frame the switch disk remains at rest. This .is caused by the clamping action of the switch springs on the disk body or on the switch plates 30 and 3l.,

As clearly shown, each switch plate has top and bottom notches 30 and 31 vin which the respective switch springs engage when the pawl frame has been swung to carry the switch disk` outwardly. As each full outward swing of the pawl frame effects at least a 90 degree rotation -of .the switch disk, notches 46 and 46 are provided in the disk body on a diametral line at right angles with the line of the switch plate notches. The switch disk is therefore; after each 90 degree rotation locked by theA engagement of the switch springs in either the notches 30', 3l or the notches 46, 46', the switch disk alternately eiecting electrical connection and disconnection of the` switch springs. If the chain is pulled only partway out and then released, the pawl frame will be restored by the spring 43 while the switch disk will be held by the frictional engagement therewith of the switch springs in the position into which it was set by the partway outward movement of the pawl frame. As soon as the pawl frame is then swung fully outwardly a set of locking notches will receive the switch springs.

The structure thus far described is incased in a shell body 47 and cap 48 in a well knownmanner, an insulating lining 49 being also provided. Thecap has the inlet 50 for current supplyleads.

It is evident that the switch mechanism described may be used with equal advantage in other electrical circuit controlling devices and I do not therefore desire to be limited to the exact structure and application shown and described, except as such limitations apdpear specifically in the appended claim which is the `following In electrical switch mechanism, vthe comybinationf'of a ratchet disk, a pawl frame,

a pawlfpifvoted intermediate its ends to said frame, av pull chain connected with the tailv name to the foregoing speciiication 'in thepresence of two subscribing witnesses.

WILLIAM HERSKOVITZ.

vlitnesses:

R. H. SMITH, M. J. MCKENDRY. 

